Looks like a great plan - of course it will almost definitely change between now and the rack being full

So I would go slowly - and keep the starter rack for overflow!

I agree with farkas - performance mixer seems like a good idea - you will also need a submixer - maybe 2 panmixjrs (for drums), as does links and a different second filter

I'd also add to that kinks and a matrix mixer - to help with modulation - I would prioritise these before adding more modulation

"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia

Utility modules are the dull polish that makes the shiny modules actually shine!!!

sound sources < sound modifiers < modulation sources < utilities